$ hg init repo

  $ cd repo

  $ cat > a <<EOF

  > a

  > b

  > c

  > EOF

  $ hg ci -Am adda

  adding a

  $ cat > a <<EOF

  > d

  > e

  > f

  > EOF

  $ hg ci -m moda

  $ hg diff --reverse -r0 -r1

  diff -r 2855cdcfcbb7 -r 8e1805a3cf6e a

  --- a/a	Thu Jan 01 00:00:00 1970 +0000

  +++ b/a	Thu Jan 01 00:00:00 1970 +0000

  @@ -1,3 +1,3 @@

  -d

  -e

  -f

  +a

  +b

  +c

  $ cat >> a <<EOF

  > g

  > h

  > EOF

  $ hg diff --reverse --nodates

  diff -r 2855cdcfcbb7 a

  --- a/a

  +++ b/a

  @@ -1,5 +1,3 @@

   d

   e

   f

  -g

  -h

should show removed file 'a' as being added

  $ hg revert a

  $ hg rm a

  $ hg diff --reverse --nodates a

  diff -r 2855cdcfcbb7 a

  --- /dev/null

  +++ b/a

  @@ -0,0 +1,3 @@

  +d

  +e

  +f

should show added file 'b' as being removed

  $ echo b >> b

  $ hg add b

  $ hg diff --reverse --nodates b

  diff -r 2855cdcfcbb7 b

  --- a/b

  +++ /dev/null

  @@ -1,1 +0,0 @@

  -b